1. Gerhard Steinke 1 Information Systems Management Gerhard Steinke Networks BUS 6170 Spring 2014

2. We Live in a Networked World… Gerhard Steinke 2 Mainframe Server Networked Workgroups Clients POS Work Station WAN Communications Services Local Manager Server Communications Products Laptop

3. Telecommunication Trends Gerhard Steinke 3  Use of Internet/WWW  Faster communication speeds  Wireless  GPS  Interoperability, new services and applications  Global connectivity, collaboration  Single source for voice, images, video, and data  Electronic commerce  Intranet, extranet, web-enabled  And thus… Information overload!

4. Telecommunications Gerhard Steinke 4 Definition: The exchange of information in any form over computer-based networks Why Telecommunication networks?  Share data  Between computers, email, file-sharing  Between a computer and a server, remote databases  Share peripheral devices  Printers, Scanners, Fax Types:  LAN/WAN local area network – Wide area network  Internet -  Intranets- Boeing internal  Extranets – Companies allow other companies within networks Coke let’s safe way see into the inventory

5. Network Components (Three pieces: sender, medium, receiver) Gerhard Steinke 5 Server Client Network Interface Card (NIC) Network Operating System (NOS) Network Interface Card (NIC) Cable (optional)

6. Physical Transmission Media Gerhard Steinke 6 Twisted Pair - similar to phone wire  Cooper wire – 300ftHubs – Refresh the signal  Cheaper than fiber optics- Put into the classrooms Coaxial Cable - like cable TV wire, (thick, thin)  Not seeing this any more Fiber Optics  glass fiber, using light  greater bandwidth  lower attenuation, greater repeater spacing  Railroad tracks to new york  Under the ocean to Japan  Fiber opt. between buildings at SPU- then twisted pair between classrooms  Must have a network interface card - $150

7. Wireless Transmission Media Gerhard Steinke 7 Microwave – line of sight Satellite – microwave signals  HEO - 22,000 mi. up, LEO - 500 mi. up Cellular, PCS (personal communication services) – radio signals between cell towers Wireless LANs – IEEE 802.11b,a,g,n WiMAX – IEEE 802.16 Bluetooth

8. Network Hardware Gerhard Steinke 8 Modems – analog, digital Network Cards - Ethernet, Wireless Repeaters Hubs, Switches, Bridges, Routers, Gateways

9. Network Management Software Gerhard Steinke 9 Manage user accounts Manage performance Assigning priorities Detecting and correcting errors Network management  Traffic, security, capacity planning,…

10. Network Topology Gerhard Steinke 10 Star - using hubs, switches  broadcast to all (?) Bus, e.g. Ethernet  terminators  maximum length  uses Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Ring, e.g. Token Ring  every workstation sends to next  whoever has token, may send Star-Bus, Star-Ring Hybrids

11. Network Protocols Gerhard Steinke 11 Set of rules that allow communication All computers on a network must speak the same “language”  A common protocol Protocols determine…  When a computer can send a message  If a message is destined for your computer  If your computer should pass a message along to another computer OSI Model – 7 layer model TCP/IP

12. Wireless Technology Advantages Gerhard Steinke 12 don’t need cabling mobile good for  historical buildings  manufacturing environments – no cables  real time inventory – walking around  PDA - personal digital assistants  Interference with other wireless users  Not even a plug in option

13. Client/Server Networks Gerhard Steinke 13 Centralized account management  Users need only one password for any machine on the network High-powered servers handle the “big” tasks  Can have huge arrays of disks and large numbers of peripheral devices Single-point failure  The server is down… Need a dedicated server machine  High-end, expensive Somebody has to be the administrator  An extra employee?  Administrator controls all configuration and security issues

14. Network Management Model Gerhard Steinke 14 Backup & Restore Media Control & Storage Database Management Transaction Data Collect Software Licensing Distribution & Control Employee Profile Resource Accounting Charge back Services Inventory Control Fault Reporting Problem Escalation Resolution Assessment Help Desk Facilities Remote Store Mgmt. Security Administration User/Group Administration Network Configuration System Config. Workload Scheduling Performance Monitoring Performance Analysis Capacity Planning DataManagement Administration ProblemManagement AssetManagement Planning & Scheduling IntegratedControl

15. Collaboration Calendar Blog IM Podcast Desktop sharing Wikis Web Conferencing

16. Business Values / Ethical Issues Gerhard Steinke 16 Geographic barriers – non digital part? Time barriers – personal part? Cost barriers – eliminate air travel? Structural barriers – relationships? Public wireless access points Neighbors access point? Tracking – GPS